Offset printing machine



FIG. 1 is a front perspective view of an offset printing machine showing our design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a rear elevational view thereof. 

The ornamental design for an offset printing machine, as shown. 